I could depolymerize you could depolymerize she could depolymerize we could depolymerize you could depolymerize they could depolymerize
V-ing form
I could be depolymerizing you could be depolymerizing she could be depolymerizing we could be depolymerizing you could be depolymerizing they could be depolymerizing
Perfect
I could have depolymerized you could have depolymerized she could have depolymerized we could have depolymerized you could have depolymerized they could have depolymerized
V-ing perfect
I could have been depolymerizing you could have been depolymerizing she could have been depolymerizing we could have been depolymerizing you could have been depolymerizing they could have been depolymerizing
Negation
Simple form
I couldn't depolymerize you couldn't depolymerize she couldn't depolymerize we couldn't depolymerize you couldn't depolymerize they couldn't depolymerize
V-ing form
I couldn't be depolymerizing you couldn't be depolymerizing she couldn't be depolymerizing we couldn't be depolymerizing you couldn't be depolymerizing they couldn't be depolymerizing
Perfect
I couldn't have depolymerized you couldn't have depolymerized she couldn't have depolymerized we couldn't have depolymerized you couldn't have depolymerized they couldn't have depolymerized
V-ing perfect
I couldn't have been depolymerizing you couldn't have been depolymerizing she couldn't have been depolymerizing we couldn't have been depolymerizing you couldn't have been depolymerizing they couldn't have been depolymerizing
Interrogative form
Simple form
could I depolymerize? could you depolymerize? could she depolymerize? could we depolymerize? could you depolymerize? could they depolymerize?
V-ing form
could I be depolymerizing? could you be depolymerizing? could she be depolymerizing? could we be depolymerizing? could you be depolymerizing? could they be depolymerizing?
Perfect
could I have depolymerized? could you have depolymerized? could she have depolymerized? could we have depolymerized? could you have depolymerized? could they have depolymerized?
V-ing perfect
could I have been depolymerizing? could you have been depolymerizing? could she have been depolymerizing? could we have been depolymerizing? could you have been depolymerizing? could they have been depolymerizing?
Interro-negative form
Simple form
couldn't I depolymerize? couldn't you depolymerize? couldn't she depolymerize? couldn't we depolymerize? couldn't you depolymerize? couldn't they depolymerize?
V-ing form
couldn't I be depolymerizing? couldn't you be depolymerizing? couldn't she be depolymerizing? couldn't we be depolymerizing? couldn't you be depolymerizing? couldn't they be depolymerizing?
Perfect
couldn't I have depolymerized? couldn't you have depolymerized? couldn't she have depolymerized? couldn't we have depolymerized? couldn't you have depolymerized? couldn't they have depolymerized?
V-ing perfect
couldn't I have been depolymerizing? couldn't you have been depolymerizing? couldn't she have been depolymerizing? couldn't we have been depolymerizing? couldn't you have been depolymerizing? couldn't they have been depolymerizing?